Missing data in R...
I am reading in data in the "long" format into R to use in nlme ( ). There is some missing data that is denoted by a period "." I would like to assign these .'s the missing data value NA. I have been unable to locate code on the web that might perform this function. This is what I have thus far: dat1[dat1$y == ".", "y"] <- NA where the data are assigned to data frame dat1 and the missing data is in a variable called y. If anyone has a suggestion I am all ears. Thanks, Jeff
**************************************************************************** Jeffrey R. Harring, Assistant Professor Department of Measurement, Statistics& Evaluation (EDMS) 1230 Benjamin Building University of Maryland College Park, MD 20742-1115 Phone: 301.405.3630 Fax: 301.314.9245 Email: harring at umd.edu Web: http://www.education.umd.edu/EDMS/fac/Harring/webpage.html